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    "hist(x, bins=None, range=None, density=None, facecolor=None, alpha)  \n",
    "Plot a histogram.  \n",
    "Compute and draw the histogram of `x`. The return value is a tuple "
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    "**Parameters**  \n",
    "- x: array or sequence of arrays  \n",
    "Input values,this takes either a single array or sequence of arrays which are not required to be of the same length.  \n",
    "- density: boolean, optional  \n",
    "If \"True\", the first element of the return tuple will be the counts normalized to form a probability density, i.e., the area (or integral) under the histogram will sum to 1.  \n",
    "This is achieved by dividing the count by the number of observations times the bin width and not dividing by the total number of observations. If `stacked` is also `True`, the sum of the histograms is normalized to 1.  \n",
    "\n"
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